非线性负载下动车组辅助逆变器控制方式优化

Optimization of Control Mode for the Auxiliary Inverter of the Electric Multiple Unit under Nonlinear Load

提出将逆变器的非线性负载畸变控制问题转化为动态冲击性不平衡负载的畸变控制问题,将用于不平衡控制的改进型双闭环复合控制模型引入辅助供电系统逆变器控制方式中。通过信号延迟对消(delay signal cancellation,DSC)技术分离电压的正负序分量,并分别跟踪补偿,改善输出电压波形。基于MATLAB/Simulink及dSPACE半实物仿真平台搭建的某车型辅助逆变器模型,验证了所引入的改进型控制方法对三相整流器负载和单相不平衡负载下的逆变器输出电压畸变均有显著改善,拓展了基于DCS的改进型双闭环复合控制方法的应用范围。

It was proposed that nonlinear load distortion control of the inverter should be considered as control over dynamic impact unbalanced load.The improved double closed-loop composite control model intended for unbalanced control was introduced into the inverter control mode of the auxiliary power supply system.Namely,the positive and negative sequence components of voltage were separated by means of delay signal cancellation(DSC)technology,and compensations were tracked respectively so as to improve the output voltage waveform.An auxiliary inverter model established for a certain train type on the basis of the MATLAB/Simulink and dSPACE semi-physical simulation platform verified that the introduced modified control method could significantly improve the inverter output voltage distortion under three-phase rectifier load or single-phase unbalanced load,thus expanding the application scope of the DCS-based modified double closed-loop composite control method.